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DIDCSU E1 Version
Table 4-4
E1 Port Configuration Menu Parameter
Command
In
In Service: Use this option to place the port on line.
En
CRC-4: Cyclic Redundancy Check (CRC-4) is an error-checking
algorithm performed on digital transmissions. On a frame-by-frame
basis, a numerical value is derived from the data in the bit stream at
one end of transmission. When each frame reaches the receive end, the
cyclic redundancy check is calculated again and compared with the
value generated by the transmit-side data. Discrepancies usually
indicate one or more transmission errors.
Fn
Carrier Failure Alarm (CFA): CFA is an alarm sent from the node
indicating an E1 port has exceeded the Loss-of-Frame and the Loss-of-
Signal seconds threshold set in the Net Port Alarm Configuration Menu.
When enabled, an alarm is generated at the node and an Alarm
Indication Signal (AIS) is sent down stream to the other node.
Sn
Frame Alignment Signal Error (FASE) Alarm Category: This option
indicates the number of FAS errors has exceeded 10
occurs in bits 2-8 of the FAS frame and bit 2 of the non-FAS frame.
A minor FASE alarm is indicated by an amber light on the network LED.
A major FASE alarm is indicated by a red light on the network LED, and
the alarm relay is enabled.
Mn
Frame Mode: Used to set the way timeslots 0 and 16 will be handled by
the DIDCSU.
CAS—Timeslot 0 is used for framing and timeslot 16 carries switched
telephone call setup and supervision information according to the
Channel Associated Signalling standard. This selection may apply if
some or all of the timeslots are used for PBX-based voice traffic.
CCS—Timeslot 0 is used for framing and timeslot 16 carries switched
telephone call setup and supervision information according to the
Common Channel Signalling standard. This selection may apply if
some or all of the timeslots are used for PBX based voice traffic.
31 Channel—Timeslot 0 is used for framing and timeslot 16 is
available for data traffic as are the remaining 30 timeslots.
Unframed—No timeslot is used for framing or voice channel signalling.
This will not be a valid selection for most E1 facilities. Network timing
cannot be used in this mode.
Nn
Alarm Declare Time (sec): This option indicates how many seconds will
elapse before a message regarding a problem is displayed.
Bn
Enable Inband: This option dedicates an E1 timeslot as a maintenance
channel to receive and transmit remote configuration and diagnostic
information. The channel must be enabled on both ends of the E1. You
must designate the timeslot also (see below) only if inband is enabled.
The unit will not activate if timeslot 0 is chosen as the default.
This feature can be used to extend NCM management to a DIDCSU at
the far end of an E1 circuit.
Ln
Inband Timeslot: Select one of the 31 timeslots for inband
management before enabling the inband as described above. The
timeslot must be the same at both ends of the E1.
CPE Side
This option determines whether both inbands are functional.
DIDCSU
4-8
Description
Verilink DIDCSU 2912 User Manual
Yes or No
(Y/N)
Yes or No
(Y/N)
Yes or No
(Y/N)
1) MINOR
-3
. A FAS bit error
2) MAJOR
1)CAS
2)CCS
3)31 CHANNEL
4)UNFRAMED
0...127 seconds
Yes or No
(Y/N)
1—31
Yes or No
Options
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